| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 53b - Kettle Moraines |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 60085 - Waukegan, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 17 | 26 | 36 | 46 | 56 | 62 | 61 | 53 | 41 | 30 | 18 | 38 |
| Avg Max Temp (°F) | 28 | 33 | 43 | 55 | 67 | 77 | 82 | 80 | 73 | 61 | 47 | 34 | 57 |
| Avg Precip (In.) | 1.62 | 1.4 | 2.2 | 3.72 | 3.45 | 3.68 | 3.6 | 4.24 | 3.41 | 2.44 | 2.59 | 2.08 | 34.43 |